Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a3b0a35267f8ad…

MALICIOUS

PDF

81.5 KB Created: 2021-03-22 05:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0784eb2130d48984d35aa8df481ac13a SHA-1: b43bbbd162d9cc9312c3f09f1c9fc7447ccc2db0 SHA-256: 05a3b0a35267f8ade5cbef992c68fecf4293624e47273596388a4f70d0a0615b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/award?keyword=ansi+c+balaguruswamy+pdf+download+free PDF link annotation
    • https://niwurepezexeted.weebly.com/uploads/1/3/5/3/135312419/f2c4c420.pdfIn PDF document text
    • https://duzesoduvumasu.weebly.com/uploads/1/3/4/1/134131570/ec24779dcea08.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/nugapagojokow.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/lezomi.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/lerovedo.pdfIn PDF document text
    • https://kuvukodu.weebly.com/uploads/1/3/1/4/131453249/mufebo.pdfIn PDF document text
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/gitosuwidebute_zamekedubetagu_rometugasexose.pdfIn PDF document text
    • https://sofotegepure.weebly.com/uploads/1/3/4/5/134522016/78c138.pdfIn PDF document text
    • https://gasulemuj.weebly.com/uploads/1/3/4/3/134352818/nipib-jumosajosin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_3dfcd27a16ce4e1994396c9a8c767a20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/formal_casual_outfits_for_guys.pdfIn PDF document text
    • http://ditorodizo.epizy.com/jomalarizilezo.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/lugakubi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/72561473069.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/hrv_buying_guide.pdfIn PDF document text
    • http://retobawunabe.rf.gd/informal_email_writing_examples_for_students.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_4080b8bc968345fea76bc2a484863c84.pdf?index=trueIn PDF document text
    • http://kutoduno.rf.gd/plantronics_5200_uc_vs_legend.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/from_flat_to_all_that.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 5796 bytes
SHA-256: 26f6180665e149843a88222e5d1e6d272c460fefa3eb2fe6a4019c4df6a997d1
font_01_sfnt_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 12676 bytes
SHA-256: e0e5b4da8c072d694afe8665638151c0f257652803cd4cf4e68d231ea030e76f

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